Using a VPN will prevent your ISP from selling your IP logs to data brokers. It also obfuscates your IP to websites you visit to make their fingerprinting less precise. All your ISP can see is that you’re connecting to/from a VPN server through an encrypted tunnel and maybe some metadata like amount of data transferred.

Hard to compare value to free stuff like encrypted DNS and an ad blocker but a VPN definitely has protections you wouldn’t get otherwise.